F4 on GE microwave ovens reports an open humidity sensor.
Model compatibility: GE reuses codes across series and model years, so F4 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Open humidity sensor.
Humidity sensing is what F4 is about: the sensor reads as open. GE lists the code for all of its microwave ovens.
What the manual recommends
Whenever the electronic control of a microwave oven displays a fault code, the support article says to call a trained service technician to diagnose and correct it.
Next door in the code list
The shorted counterpart is F5. A different open-sensor fault is F1, for the thermal sensor.
GE microwave service for Los Angeles
Los Angeles callers can use (310) 620-9683. Say that F4 is showing and read out the model number. The microwave repair page adds detail.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your GE appliance?
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